The best ways to identify and avoid air duct cleaning scams are to check with the Better Business Bureau to see if the company has any reports of scamming customers and to talk to references. Doing research before hiring a company can save a lot of hassle in the end.
It is important to ask references specifics about the job that was completed for them to ensure that they are legitimate references. Some companies have friends and family members of the owner pretend to be references. Asking the dates that the job was completed, how long it took for the company to complete the job and if the workers worked efficiently helps you establish if the company is worth hiring and if the references are legitimate.